One good technique which aids fast and sustainable learning is to read the topic once for understanding, then quiz yourself.
Asking questions will trigger the creation and refinement of retrieval cues specific to the information or groups of information to be retrieved. Without these retrieval cues we cannot reliably bring back the information into our active output. This is why retrieving information is what actually produces more robust learning and memory. The more we try to retrieve an information the more powerful, reliable and sustainable the retrieval cues becomes.
Even when we cannot retrieve it, it gives us an accurate diagnostic on what we know and don’t know. This tells us what we should go back and study. This helps guide our studies more effectively.
Asking questions thus helps you understand more deeply through Meta-Cognition.
Check https://www.retrievalpractice.org for more about the science of Retrieval